Investments - Schedule of Net Appreciation (Decline) Recognized in Net Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Debt and Equity Securities, FV-NI [Line Items]
Total	$ 91	$ 36
Equity securities
Debt and Equity Securities, FV-NI [Line Items]
Total	61	20
Limited partnership interests carried at fair value
Debt and Equity Securities, FV-NI [Line Items]
Total	$ 30	$ 16